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Presentation Transcript

  1. Objective: Outline the 3 key parts to RNA transcription. http://www.scientificpsychic.com/fitness/transcription.gif

  2. The Activation of DNA: A 2-Part Story Part 1: Transcription • WHEN A PORTION OF DNA BECOMES ACTIVATED, THE FOLLOWING THINGS TAKE PLACE: #1 A PORTION OF DNA IS SELECTED FOR ACTIVATION. #2 DNA CAN NOT LEAVE THE NUCLEUS. #3 A COPY IS MADE OF THE PART OF DNA TO BE ACTIVATED. IT IS CALLED mRNA (messenger RNA)

  3. Nitro-gen Base Nitro-gen Base T – A G – C U – A G – C Phos-phateGroup Phos-phateGroup Ribose Sugar Deoxy-ribose Sugar DNA compared to RNA

  4. TRANSCRIPTION: THE PROCESS BY WHICH THE INFORMATION ON A GENE OR PORTION OF DNA IS TRANSFERRED TO AN RNA MOLECULE. THIS TAKES PLACE INSIDE THE NUCLEUS. REMEMBER, DNA ITSELF CAN NOT LEAVE THE NUCLEUS.

  5. STEPS OF TRANSCRIPTION #1 RNA polymerase (in charge of converting a part of DNA to mRNA) “lands” on an area of DNA called the PROMOTER. The promoters are stretches of DNA that have a code that tells polymerases to “LAND HERE!”

  6. http://www.geneticengineering.org/chemis/Chemis-NucleicAcid/Graphics/Transcription.gifhttp://www.geneticengineering.org/chemis/Chemis-NucleicAcid/Graphics/Transcription.gif

  7. #2 RNA polymerase then OPENS THE DOUBLE HELIX (hence the super strength), exposing the code and the nitrogen bases with in. #3 RNA polymerase reads the DNA code and creates a single RNA strand. #4 RNA polymerase knows when to stop when he/she reaches the “STOP” code on the original DNA strand. #5 RNA polymerase then leaves up, up, and away.

  8. DNA strand one: AAT TCG CCG DNA strand two: TTA AGC GGC DNA strand one: AAT TCG CCG RNA strand two: UUA AGC GGC